A feature of commander. Allows up to 5 buildings to be queued. Resources for each building must be available when it reaches the top of the queue, otherwise the queue is cleared. However, a lot of people experience a bug which causes the buildings in the queue to show huge amounts of time due to the fact that robotic and nanite factories are not taken in to account. You may add/delete buildings in this queue at any time (mainly because it does not take resources when you add next building to queue)